As part of the Adobe Acrobat Trust List program, Adobe periodically pushes vetted trust anchors (certificates) that can be used in digital signature workflows. In the Load trusted root certificates from Adobe drop down list, specify how trusted root certificates are loaded:

Choose When launching PDF in Internet Explorer, prompt user with Open/Save dialog
if users should see an open or save prompt when clicking a link to a PDF or
FDF file. This preference sets AcroPDF.FDF.1\EditFlags.

The Product Improvement Program collects usage and other data from clients so that Adobe
can improve the product. To disable sending data back to Adobe, choose Disable Product
Improvement Program to disable the Help > Improvement Program Options menu item. This
preference sets: